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Energy (E) is defined in physics as the ability to do work. The principle of the conservation of energy states that energy can be neither created nor destroyed in the universe, but it may be converted from one form to another, including the energy equivalent...

A Text-book of Applied Mechanics and Mechanical Engineering - Page 51
by Andrew Jamieson - 1903
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A Text-book on Applied Mechanics: Specially Arranged for the Use ..., Volume 1

Andrew Jamieson - Mechanical engineering - 1895 - 446 pages

...though it may be transformed into any of the forms of which energy is susceptible. (Clerk Maxwell.) DEFINITION. — Energy confers upon a body possessing...of any system without an equivalent loss or gain of enei'gy in some other system. If in any isolated system there be an increase in one form of energy...

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